Bright and compact optical-compensation type zoom lens system

ABSTRACT

A bright and compact optical-compensation type zoom lens system comprising a first lens group I having positive refractive power, a second lens group II having negative refractive power, a third lens group III having positive refractive power, and a fourth lens group IV having positive refractive power, the zoom lens system being arranged to carry out zooming by keeping the lens groups II and IV fixed and moving the lens groups I and III, the zoom lens system being arranged so that the focal length in the tele-position is long and, moreover, the quality of image is good.

BACKGROUND OF THE INVENTION

(a) Field of the Invention

The present invention relates to a bright and compact optical-compensation type zoom lens system.

(b) Description of the Prior Art

As for most of optical-compensation type zoom lens systems of medium telephoto class (with focal lengths about 100 mm to 200 mm) which are commercially available at present, the aperture ratios are large and overall lengths of lens systems are also large. Among known optical-compensation type zoom lens systems, there are such lens systems of which the aperture ratios are small and which are designed compactly. However, their qualities of images are not good. Out of known lens systems, the zoom lens system disclosed in the Japanese Published Unexamined Patent Application No. 142,251/78 has a small aperture ratio and favourably corrected aberrations. However, its focal length in the tele-position in not long.

SUMMARY OF THE INVENTION

It is, therefore, a primary object of the present invention to provide a bright and compact optical-compensation type zoom lens system for which the focal length in the tele-position is long and, moreover, the quality of image is good.

The zoom lens system according to the present invention has the basic lens configuration as shown in FIG. 1. That is, the zoom lens system according to the present invention comprises a first lens group I having positive refractive power, a second lens group II having negative refractive power, a third lens group III having positive refractive power, and a fourth lens group IV having positive refractive power, the zoom lens system being an optical-compensation type zoom lens system arranged to carry out zooming by keeping the second lens group II and fourth lens group IV fixed and moving the first lens group I and third lens group III in the same moving direction by the same amount of movement. Besides, the first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, the second lens group II comprises at least one positive lens element and at least one negative lens element and comprises a cemented doublet, which consists of a positive lens element and negative lens element and of which the surface on the object side is concave toward the object side, the third lens group III comprises a cemented doublet consisting of a positive lens element and negative lens element, and the fourth lens group IV comprises at least one positive lens and at least one negative lens. In other words, the zoom lens system according to the present invention has lens configurations as shown in FIGS. 3, 4 and 5. The lens system having the lens configuration shown in FIG. 3 is arranged so that the first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element and having positive refractive power, the second lens group II comprises a negative single lens and cemented doublet, which consists of a negative lens element and positive lens element and has a concave surface on the object side, and the second lens group II as a whole has negative refractive power, the third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element and having positive refractive power, and the fourth lens group IV comprises a positive lens, negative lens and positive lens and has positive refractive power. The lens system having the lens configuration shown in FIG. 4 is arranged so that the first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, the second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element, the third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, and the fourth lens group IV comprises three lenses, i.e., a positive lens, negative lens and positive lens. The lens system having the lens configuration shown in FIG. 5 is arranged so that the first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, the second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element, the third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, and the fourth lens group IV comprises two lenses, i.e., a positive lens and negative lens. Besides, the zoom lens system according to the present invention is arranged to satisfy the following conditions.

    0.5F.sub.W <|F.sub.II |<1.0F.sub.W       ( 1)

    0.6F.sub.W <F.sub.III <1.5F.sub.W                          ( 2)

    0.6F.sub.W <r.sub.I-1 <2.0F.sub.W                          ( 3)

    0.4F.sub.W <|r.sub.II |<1.2F.sub.W       ( 4)

    ΔN.sub.II +ΔN.sub.III ≦0.4              (5)

    Δν.sub.I >15                                      (6)

In the above-mentioned conditions, reference symbol F_(W) represents the shortest focal length of the lens system as a whole, reference symbol F_(II) represents the focal length of the second lens group II, reference symbol F_(III) represents the focal length of the third lens group III, reference symbol r_(I-1) represents the radius of curvature of the surface on the object side of the first lens group I, reference symbol r_(II) represents the radius of curvature of the surface on the object side of the cemented doublet constituting the second lens group II, reference symbol ΔN_(II) represents the difference N'_(II) -N"_(II) between the mean value N'_(II) of refractive indices of positive lenses constituting the second lens group II and mean value N"_(II) of refractive indices of negative lenses constituting the second lens group II, reference symbol ΔN_(III) represents the difference N"_(III) -N'_(III) between the mean value N"_(III) of refractive indices of negative lenses constituting the third lens group III and mean value N'_(III) of refractive indices of positive lenses constituting the third lens group III, and reference symbol Δν_(I) represents the value ν'_(I) -ν"_(I) obtained by subtracting the Abbe's number ν"_(I) of the negative lens constituting the first lens group I from the Abbe's number ν'_(I) of the positive lens constituting the first lens group I.

For an optical-compensation type zoom lens system, power distribution for respective lens groups should be decided so that the movement of focusing surface at the time of zooming is carried out within an allowable range which is determined by the depth of focus. At that time, it is desirable that the focusing surface comes to the same position at three points in the zooming range and this depends on power distribution in the second lens group II and third lens group III. The conditions (1) and (2) are established for the above-mentioned purpose. That is, when F_(II) or F_(III) becomes larger than the upper limit of the condition (1) or (2) when it is so arranged that the amount of movement of the focusing surface is kept within a predetermined range, the amount of lens movement at the time of zooming becomes too large and it becomes difficult to provide the space required for lens movement within the lens barrel. Moreover, it becomes difficult to make the lens system compact. If F_(II) or F_(III) becomes smaller than the lower limit of the condition (1) or (2), aberrations will be aggravated and it becomes difficult to correct them favourably.

Referring to FIGS. 2A and 2B, the position of the shortest focal length is shown in FIG. 2A and the position of the longest focal length is shown in FIG. 2B. In the position of the shortest focal length (FIG. 2A), the height of incidence of paraxial ray upon each lens group is represented by reference symbol h_(iW) (i=I, II or III), and the height of incidence of paraxial principal ray upon each lens group is represented by reference symbol h_(iW). In the position of the longest focal length (FIG. 2B), the height of incidence of paraxial ray upon each lens group is represented by reference symbol h_(iT), and the height of incidence of paraxial principal ray upon each lens group is represented by reference symbol h_(iT). When the height of incidence of paraxial ray is larger, spherical aberration caused at the refractive surface becomes larger. As, however, the heights of incidence of rays have the relation of h_(IW), h_(IIW) <h_(IIIW) and relation of h_(IIT), h_(IIIT) <h_(IT), spherical aberration in the position of the longest focal length might remain in the undercorrected state even when spherical aberration is favourably corrected in the position of the shortest focal length only. Moreover, as there is the relation of h_(IT) >h_(IIT), h_(IIIT), h_(IW), h_(IIW), h_(IIIW), under-corrected sperical aberration tends to become large especially in the position of the longest focal length. To make under-corrected spherical aberration in the position of the longest focal length small, the radius of curvature of the first surface should be made large. On the other hand, when it is tried to correct the above-mentioned spherical aberration not by the first surface but by making the radius of curvature of the surface on the object side on the cemented doublet in the second lens group II small, the refractive angle of the principal ray at the above-mentioned surface becomes large. As there is the relation of h_(IIW) >h_(IIIW), it becomes difficult to correct the above-mentioned refractive angle by the third lens group III, in the position of the shortest focal length, and barrel-type distortion occurs as a result. When it is supposed here that the value of the refractive angle of the principal ray is within the range of values to be treated by the paraxial theory, the refractive angle can be expressed by hφ where reference symbol φ represents the refractive power of refractive surface. To keep distortion in the favourably corrected state, it is essential that the sum of refractive angles in the lens system as a whole, i.e., the sum Σhφ of refractive angles at respective surfaces in the lens system, is arranged as a value within a certain range as it is pointed out by Berek. When it is tried to make the barrel-type distortion caused in the position of the shortest focal length small by making the radius of curvature of the surface on the object side of the cemented doublet in the second lens group II large, another aberration related to the principal ray, i.e., astigmatism, causes a difference between values of astigmatism to be caused at both ends of zooming state (in the wide position and tele-position) because there is the relations of h_(IIW) >h_(IIIW) and h_(IIT) ≈h_(IIIT). Consequently, even when the astigmatic difference at one end of zooming state is corrected favourably, it becomes difficult to favourably correct the astigmatic difference at the other end of zooming state.

When the above points are in the adequate state, influence of cemented surfaces in the second lens group II and third lens group III on aberrations becomes important. When the differences between the refractive indices of lens elements on both sides of those cemented surfaces are made too large, it becomes necessary to make the radii of curvature of cemented surfaces large in order to correct spherical aberration. In that case, however, coma and astigmatism become unfavourable.

As for chromatic aberration, it is preferable to make all lens groups respectively achromatic. However, to correct longitudinal chromatic aberration and lateral chromatic aberration in the well balanced state, it is not always essential to make all lens groups respectively achromatic. As, however, chromatic aberration to be caused by the first lens group I is large, the first lens group should be made achromatic to a certain degree because this is required for correcting longitudinal chromatic aberration and lateral chromatic aberration in the well balanced state by means of the lens groups II, III and IV.

The conditions (3) through (6) are established by taking the above-mentioned points into consideration.

If, in the condition (3), r_(I-1) becomes smaller than the lower limit, spherical aberration will be undercorrected. If r_(I-1) becomes larger than the upper limit of the condition (3), asymmetry of coma increases remarkably and it becomes difficult to correct it.

If, in the condition (4), r_(II) becomes smaller than the lower limit, spherical aberration will be overcorrected and, moreover, barrel type distortion becomes large at the position of the shortest focal length. If r_(II) becomes larger than the upper limit of the condition (4), the astigmatic difference becomes large and it becomes difficult to correct it.

If, in the condition (5), ΔN_(II) +ΔN_(III) becomes larger than the upper limit, influence of cemented surfaces on aberrations becomes strong and, consequently, aberrations become unbalanced.

To make spherical aberration and astigmatism well balanced with each other when the conditions (4) and (5) are satisfied, it is preferable to select radii of curvature r_(III-1) and r_(III-2) of the surface on the object side and cemented surface of the cemented doublet in the third lens group III so that they satisfy the condition (7) shown below.

    0.6<|r.sub.III-1 r/.sub.III-2 |<2.5      (7)

If, in the condition (6), Δν_(I) becomes smaller than the lower limit, it becomes difficult to correct chromatic aberration favourably in all states of zooming.

For correction of chromatic aberration, it is more preferable to select the radius of curvature R_(I-2) of the cemented surface of the cemented doublet in the first lens group I so that it satisfies the following condition (8) when the above-mentioned condition (6) is satisfied.

    |r.sub.I-2 |>0.4F.sub.W                  ( 8)

When it is so arranged that the above-mentioned conditions are respectively satisfied, it is possible to obtain a zoom lens system with high performance. Besides, to correct curvature of field more favourably by making Petzval's sum an adequate value, it is preferable to further satisfy the condition (9) shown below wherein reference symbol N_(IV) represents the mean value of refractive indices of respective lenses constituting the fourth lens group IV.

    N.sub.IV >1.5                                              (9)

When N_(IV) becomes smaller than 1.5, the image surface will curve toward the object side and it becomes difficult to correct curvature of field favourably.

Moreover, when the following condition (10) is further satisfied, correction of Petzval's sum becomes comparatively easy and balance of aberrations becomes more favourable.

    N.sub.I >1.5                                               (10)

In the above condition (10), reference symbol N_(I) represents the mean value of refractive indices of respective lenses constituting the first lens group I.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates the basic lens configuration of the zoom lens system according to the present invention;

FIG. 2A illustrates the heights of incidence of paraxial ray and principal ray upon respective lens groups of the zoom lens system according to the present invention at the position of the shortest focal length;

FIG. 2B illustrates the heights of incidence of paraxial ray and principal ray upon respective lens groups of the zoom lens system according to the present invention at the position of the longest focal length;

FIG. 3 shows a sectional view of Embodiments 1 through 10 of the zoom lens system according to the present invention;

FIG. 4 shows a sectional view of Embodiments 11 through 16 of the zoom lens system according to the present invention;

FIG. 5 shows a sectional view of Embodiments 17 and 18 of the zoom lens system according to the present invention; and

FIGS. 6 through 23 respectively show graphs illustrating aberration curves of Embodiments 1 through 18 of the zoom lens system according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the zoom lens system according to the present invention described in the above are as shown below.

    ______________________________________                                         Embodiment 1                                                                   ______________________________________                                         r.sub.1 = 106.068                                                               d.sub.1 = 8.16 n.sub.1 = 1.63854                                                                           ν.sub.1 = 55.4                                 r.sub.2 = -89.917                                                               d.sub.2 = 2.56 n.sub.2 = 1.6398                                                                            ν.sub.2 = 34.5                                 r.sub.3 = 430.595                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 630.592                                                               d.sub.4 = 1.58 n.sub.3 = 1.47069                                                                           ν.sub.3 = 67.4                                 r.sub.5 = 53.66                                                                 d.sub.5 = 5.28                                                                r.sub.6 = -51.723                                                               d.sub.6 = 1.49 n.sub.4 = 1.56873                                                                           ν.sub.4 = 63.2                                 r.sub.7 = 57.981                                                                d.sub.7 = 6.4  n.sub.5 = 1.64769                                                                           ν.sub.5 = 33.8                                 r.sub.8 = -167.369                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 97.414                                                                d.sub.9 =  1.51                                                                               n.sub.6 = 1.80518                                                                           ν.sub.6 = 25.4                                 r.sub.10 = 42.127                                                               d.sub.10 = 7.99                                                                               n.sub.7 = 1.64328                                                                           ν.sub.7 = 47.9                                 r.sub.11 = -90.745                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 53.361                                                               d.sub.12 = 3.89                                                                               n.sub.8 = 1.617                                                                             ν.sub.8 = 62.8                                 r.sub.13 = 2063.483                                                             d.sub.13 = 5.93                                                               r.sub.14 = -72.391                                                              d.sub.14 = 2.09                                                                               n.sub.9 = 1.56732                                                                           ν.sub.9 = 42.8                                 r.sub.15 = 59.667                                                               d.sub.15 = 7.4                                                                r.sub.16 = -75.87                                                               d.sub.16 = 5.74                                                                               n.sub.10 = 1.6516                                                                           ν.sub.10 = 58.7                                r.sub.17 = -43.246                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.57   5.616         37.409  6.759                                           147.62   26.691        16.335  27.833                                          193      41.826        1.199   42.968                                          F.sub. II = -0.714F.sub.W                                                                           F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 1.034F.sub.W                                                                            |r.sub.II | = 0.504F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.28988                                                    Δν.sub.I = 20.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 2                                                                   ______________________________________                                         r.sub.1 = 105.22                                                                d.sub.1 = 8.27 n.sub.1 = 1.6935                                                                            ν.sub.1 = 53.2                                 r.sub.2 = -116.871                                                              d.sub.2 = 2.56 n.sub.2 = 1.6727                                                                            ν.sub.2 = 32.1                                 r.sub.3 = 294.901                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 459.551                                                               d.sub.4 = 1.58 n.sub.3 = 1.47069                                                                           ν.sub.3 = 67.4                                 r.sub.5 = 55.4                                                                  d.sub.5 = 5.29                                                                r.sub.6 = -49.782                                                               d.sub.6 = 1.49 n.sub.4 = 1.56873                                                                           ν.sub.4 = 63.2                                 r.sub.7 = 68.045                                                                d.sub.7 = 6.33 n.sub.5 = 1.6398                                                                            ν.sub.5 = 34.5                                 r.sub.8 = -157.932                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 100.383                                                               d.sub.9 =  1.51                                                                               n.sub.6 = 1.80518                                                                           ν.sub.6 = 25.4                                 r.sub.10 = 45.145                                                               d.sub.10 = 8.13                                                                               n.sub.7 = 1.64328                                                                           ν.sub.7 = 47.9                                 r.sub.11 = -90.856                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 51.818                                                               d.sub.12 = 4.54                                                                               n.sub.8 = 1.6935                                                                            ν.sub.8 = 53.2                                 r.sub.13 = 127.254                                                              d.sub.13 = 7.1                                                                r.sub.14 = -283.406                                                             d.sub.14 = 2.78                                                                               n.sub.9 = 1.59551                                                                           ν.sub.9 = 39.2                                 r.sub.15 = 53.47                                                                d.sub.15 = 8.59                                                               r.sub.16 = 361.809                                                              d.sub.16 = 6.61                                                                               n.sub.10 = 1.6935                                                                           ν.sub.10 = 53.2                                r.sub.17 = -161.703                                                            F        D.sub.1       D.sub.2 D.sub.3                                         102.58   4.714         37.563  3.119                                           147.62   25.789        16.489  24.193                                          193      40.924        1.353   39.328                                          F.sub.II = -0.714F.sub.W                                                                            F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 1.026F.sub.W                                                                            |r.sub.II | = 0.485F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.28199                                                    Δν.sub.I = 21.1                                  ______________________________________                                    

    ______________________________________                                         Embodiment 3                                                                   ______________________________________                                         r.sub.1 = 83.719                                                                d.sub.1 = 7.8  n.sub.1 = 1.60311                                                                           ν.sub.1 = 60.7                                 r.sub.2 = -178.01                                                               d.sub.2 = 2.49 n.sub.2 = 1.59551                                                                           ν.sub.2 = 39.2                                 r.sub.3 = 213.01                                                                d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 127.605                                                               d.sub.4 = 1.58 n.sub.3 = 1.47069                                                                           ν.sub.3 = 67.4                                 r.sub.5 = 50.027                                                                d.sub.5 = 5.63                                                                r.sub.6 = -52.717                                                               d.sub.6 = 1.49 n.sub.4 = 1.56873                                                                           ν.sub.4 = 63.2                                 r.sub.7 = 76.081                                                                d.sub.7 = 6.3  n.sub.5 = 1.68893                                                                           ν.sub.5 = 31.1                                 r.sub.8 = -516.424                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 95.301                                                                d.sub.9 =  1.51                                                                               n.sub.6 = 1.80518                                                                           ν.sub.6 = 25.4                                 r.sub.10 = 44.296                                                               d.sub.10 = 8.23                                                                               n.sub.7 = 1.62299                                                                           ν.sub.7 = 58.1                                 r.sub.11 = -86.766                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 45.454                                                               d.sub.12 = 4.71                                                                               n.sub.8 = 1.72                                                                              ν.sub.8 = 46                                   r.sub.13 = 105.219                                                              d.sub.13 = 9.32                                                               r.sub.14 = -2263.939                                                            d.sub.14 = 3.22                                                                               n.sub.9 = 1.66755                                                                           ν.sub.9 = 41.9                                 r.sub.15 = 43.134                                                               d.sub.15 = 9.05                                                               r.sub.16 = 95.423                                                               d.sub.16 = 4.43                                                                               n.sub.10 = 1.62012                                                                          ν.sub.10 = 49.7                                r.sub.17 = -2903.76                                                            F        D.sub.1       D.sub.2 D.sub.3                                         102.71   1.879         39.428  13.804                                          147.8    22.954        18.354  34.878                                          193.23   38.089        3.218   50.013                                          F.sub.II = -0.713F.sub.W                                                                            F.sub.III = 0.859F.sub.W                                  r.sub.I-1 = 0.815F.sub.W                                                                            |r.sub.II | = 0.513F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.35141                                                    Δν.sub.I = 21.5                                  ______________________________________                                    

    ______________________________________                                         Embodiment 4                                                                   ______________________________________                                         r.sub.1 = 89.93                                                                 d.sub.1 = 2.49 n.sub.1 = 1.64769                                                                           ν.sub.1 = 33.8                                 r.sub.2 = 47.682                                                                d.sub.2 = 6.74 n.sub.2 = 1.6516                                                                            ν.sub.2 = 58.7                                 r.sub.3 = 231.179                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -266                                                                  d.sub.4 = 1.58 n.sub.3 = 1.51633                                                                           ν.sub.3 = 64.2                                 r.sub.5 = 74.861                                                                d.sub.5 = 5.23                                                                r.sub.6 = -51.543                                                               d.sub.6 = 1.58 n.sub.4 = 1.691                                                                             ν.sub.4 = 54.8                                 r.sub.7 = 129.457                                                               d.sub.7 = 4.88 n.sub.5 = 1.68893                                                                           ν.sub.5 = 31.1                                 r.sub.8 = -84.447                                                               d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 157.408                                                               d.sub.9 =  1.51                                                                               n.sub.6 = 1.7847                                                                            ν.sub.6 = 26.2                                 r.sub.10 = 48.608                                                               d.sub.10 = 7.36                                                                               n.sub.7 = 1.72                                                                              ν.sub.7 = 50.3                                 r.sub.11 = -91.938                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 57.692                                                               d.sub.12 = 5.19                                                                               n.sub.8 = 1.6968                                                                            ν.sub.8 = 55.5                                 r.sub.13 = 171.955                                                              d.sub.13 = 8.55                                                               r.sub.14 = -131.619                                                             d.sub.14 = 3.11                                                                               n.sub.9 = 1.57501                                                                           ν.sub.9 = 41.5                                 r.sub.15 = 68.064                                                               d.sub.15 = 8.8                                                                r.sub.16 = 1663.829                                                             d.sub.16 = 5.19                                                                               n.sub.10 = 1.67                                                                             ν.sub.10 = 51.6                                r.sub.17 = -124.903                                                            F        D.sub.1       D.sub.2 D.sub.3                                         102.58   6.698         36.823  14.306                                          147.62   27.773        15.749  35.38                                           193      42.908        0.613   50.515                                          F.sub.II = -0.714F.sub.W                                                                            F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 0.877F.sub.W                                                                            |r.sub.II | = 0.502F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.14997                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 5                                                                   ______________________________________                                         r.sub.1 = 133.067                                                               d.sub.1 = 3.00 n.sub.1 = 1.64769                                                                           ν.sub.1 = 33.8                                 r.sub.2 = 65.29                                                                 d.sub.2 = 6.00 n.sub.2 = 1.6516                                                                            ν.sub.2 = 58.7                                 r.sub.3 = 562.205                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -217.465                                                              d.sub.4 = 2.00 n.sub.3 = 1.51633                                                                           ν.sub.3 = 64.2                                 r.sub.5 = 105.496                                                               d.sub.5 = 4.00                                                                r.sub.6 = -76.869                                                               d.sub.6 = 2.00 n.sub.4 = 1.691                                                                             ν.sub.4 = 54.8                                 r.sub.7 = 120.854                                                               d.sub.7 = 4.81 n.sub.5 = 1.68893                                                                           ν.sub.5 = 31.1                                 r.sub.8 = -130.195                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 174.709                                                               d.sub.9 =  1.92                                                                               n.sub.6 = 1.78472                                                                           ν.sub.6 = 25.7                                 r.sub.10 = 66.198                                                               d.sub.10 = 8.00                                                                               n.sub.7 = 1.691                                                                             ν.sub.7 = 54.8                                 r.sub.11 = -115.764                                                             d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 34.949                                                               d.sub.12 = 5.05                                                                               n.sub.8 = 1.63854                                                                           ν.sub.8 = 55.4                                 r.sub.13 = 88.396                                                               d.sub.13 = 5.72                                                               r.sub.14 = -336.049                                                             d.sub.14 = 3.4 n.sub.9 = 1.56732                                                                           ν.sub.9 = 42.8                                 r.sub.15 = 35.326                                                               d.sub.15 = 5.89                                                               r.sub.16 = 267.612                                                              d.sub.16 = 5.45                                                                               n.sub.10 = 1.62299                                                                          ν.sub.10 = 58.1                                r.sub.17 = -112.548                                                            F        D.sub.1       D.sub.2 D.sub.3                                         102.69   2.6           48.162  24.166                                          144.97   27.831        22.931  49.397                                          193.4    48.533        2.229   70.099                                          F.sub.II = -0.905F.sub.W                                                                            F.sub.III = 1.09F.sub.W                                   r.sub.I-1 = 1.296F.sub.W                                                                            |r.sub.II | = 0.749F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 6                                                                   ______________________________________                                         r.sub.1 = 112.279                                                               d.sub.1 = 3.00 n.sub.1 = 1.64769                                                                           ν.sub.1 = 33.8                                 r.sub.2 = 65.37                                                                 d.sub.2 = 6.00 n.sub.2 = 1.6516                                                                            ν.sub.2 = 58.7                                 r.sub.3 = 310.971                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -303.957                                                              d.sub.4 = 2.00 n.sub.3 = 1.51633                                                                           ν.sub.3 = 64.2                                 r.sub.5 = 95.796                                                                d.sub.5 = 4.00                                                                r.sub.6 = -72.999                                                               d.sub.6 = 2.00 n.sub.4 = 1.691                                                                             ν.sub.4 = 54.8                                 r.sub.7 = 120.852                                                               d.sub.7 = 4.81 n.sub.5 = 1.68893                                                                           ν.sub.5 = 31.1                                 r.sub.8 = -123.895                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 173.609                                                               d.sub.9 =  1.92                                                                               n.sub.6 = 1.78472                                                                           ν.sub.6 = 25.7                                 r.sub.10 = 59.603                                                               d.sub.10 = 8.00                                                                               n.sub.7 = 1.691                                                                             ν.sub.7 = 54.8                                 r.sub.11 = -113.364                                                             d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 32.184                                                               d.sub.12 = 5.05                                                                               n.sub.8 = 1.63854                                                                           ν.sub.8 = 55.4                                 r.sub.13 = 62.499                                                               d.sub.13 = 5.72                                                               r.sub.14 = -2741.179                                                            d.sub.14 = 3.4 n.sub.9 = 1.56732                                                                           ν.sub.9 = 42.8                                 r.sub.15 = 32.061                                                               d.sub.15 = 5.89                                                               r.sub.16 = 87.089                                                               d.sub.16 = 5.45                                                                               n.sub.10 = 1.61484                                                                          ν.sub.10 = 51.2                                r.sub.17 = -270.876                                                             F       D.sub.1       D.sub.2 D.sub.3                                         102.69   1.255         48.139  24.332                                          144.97   26.486        22.908  49.563                                          193.4    47.188        2.206   70.265                                          F.sub. II = -0.905F.sub.W                                                                           F.sub.III = 1.09F.sub.W                                   r.sub.I-1 = 1.093F.sub.W                                                                            |r.sub.II | = 0.711F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 7                                                                   ______________________________________                                         r.sub.1 = 132.817                                                               d.sub.1 = 3.00 n.sub.1 = 1.64769                                                                           ν.sub.1 = 33.8                                 r.sub.2 = 65.29                                                                 d.sub.2 = 6.00 n.sub.2 = 1.6516                                                                            ν.sub.2 = 58.7                                 r.sub.3 = 557.645                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -229.584                                                              d.sub.4 = 2.00 n.sub.3 = 1.56873                                                                           ν.sub.3 = 63.2                                 r.sub.5 = 110.963                                                               d.sub.5 = 4.00                                                                r.sub.6 = -73.683                                                               d.sub.6 = 2.00 n.sub.4 = 1.755                                                                             ν.sub.4 = 52.3                                 r.sub.7 = 434.45                                                                d.sub.7 = 5.00 n.sub.5 = 1.7552                                                                            ν.sub.5 = 27.5                                 r.sub.8 = -112.23                                                               d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 176.246                                                               d.sub.9 =  1.92                                                                               n.sub.6 = 1.78472                                                                           ν.sub.6 = 25.7                                 r.sub.10 = 65.907                                                               d.sub.10 = 8.00                                                                               n.sub.7 = 1.6935                                                                            ν.sub.7 = 53.2                                 r.sub.11 = -116.042                                                             d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 36.32                                                                d.sub.12 = 5.05                                                                               n.sub.8 = 1.63854                                                                           ν.sub.8 = 55.4                                 r.sub.13 = 108.169                                                              d.sub.13 = 5.72                                                               r.sub.14 = -243.74                                                              d.sub.14 = 3.4 n.sub.9 = 1.56732                                                                           ν.sub.9 = 42.8                                 r.sub.15 = 36.744                                                               d.sub.15 = 5.89                                                               r.sub.16 = 1812.39                                                              d.sub.16 = 5.45                                                                               n.sub.10 = 1.62299                                                                          ν.sub.10 = 58.1                                r.sub.17 = -90.179                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.69   3.249         47.493  24.121                                          144.97   28.48         22.262  49.352                                          193.4    49.182        1.56    70.054                                          F.sub.II = -0.905F.sub.W                                                                            F.sub.III = 1.09F.sub.W                                   r.sub.I-1 = 1.293F.sub.W                                                                            |r.sub.II | = 0.718F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 8                                                                   ______________________________________                                         r.sub.1 = 83.643                                                                d.sub.1 = 6.74 n.sub.1 = 1.6516                                                                            ν.sub.1 = 58.7                                 r.sub.2 = -212.523                                                              d.sub.2 = 2.49 n.sub.2 = 1.64769                                                                           ν.sub.2 = 33.8                                 r.sub.3 = 191.847                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -315.514                                                              d.sub.4 = 1.58 n.sub.3 = 1.51633                                                                           ν.sub.3 = 64.2                                 r.sub.5 = 73.972                                                                d.sub.5 = 5.23                                                                r.sub.6 = -50.788                                                               d.sub.6 = 1.58 n.sub.4 = 1.691                                                                             ν.sub.4 = 54.8                                 r.sub.7 = 129.457                                                               d.sub.7 = 4.88 n.sub.5 = 1.68893                                                                           ν.sub.5 = 31.1                                 r.sub.8 = -84.647                                                               d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 154.659                                                               d.sub.9 = 1.51 n.sub.6 = 1.78472                                                                           ν.sub.6 = 25.7                                 r.sub.10 = 45.712                                                               d.sub.10 = 7.36                                                                               n.sub.7 = 1.717                                                                             ν.sub.7 = 47.9                                 r.sub.11 = -90.848                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 54.9                                                                 d.sub.12 = 5.19                                                                               n.sub.8 = 1.6935                                                                            ν.sub.8 = 53.2                                 r.sub.13 = 136.19                                                               d.sub.13 = 8.55                                                               r.sub.14 = -180.558                                                             d.sub.14 = 3.11                                                                               n.sub.9 = 1.60717                                                                           ν.sub.9 = 40.3                                 r.sub.15 = 62.987                                                               d.sub.15 = 8.8                                                                r.sub.16 = 206.328                                                              d.sub.16 = 5.15                                                                               n.sub.10 = 1.697                                                                            ν.sub.10 = 48.5                                r.sub.17 = -227.955                                                            F        D.sub.1       D.sub.2 D.sub.3                                         102.58   5.936         36.92   14.577                                          147.62   27.011        15.846  35.651                                          193      42.146        0.71    50.786                                           F.sub.II = -0.714F.sub.W                                                                           F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 0.815F.sub.W                                                                            |r.sub.II | = 0.495F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 1.5299                                                     Δν.sub.I = 24.9                                  ______________________________________                                    

    ______________________________________                                         Embodiment 9                                                                   ______________________________________                                         r.sub.1 = 110.546                                                               d.sub.1 = 8.00 n.sub.1 = 1.60311                                                                           ν.sub.1 = 60.7                                 r.sub.2 = -109.204                                                              d.sub.2 = 2.49 n.sub.2 = 1.5927                                                                            ν.sub.2 = 35.3                                 r.sub.3 = 589.506                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 531.834                                                               d.sub.4 = 1.58 n.sub.3 = 1.47069                                                                           ν.sub.3 = 67.4                                 r.sub.5 = 55.243                                                                d.sub.5 = 5.23                                                                r.sub.6 = -50.403                                                               d.sub.6 = 1.49 n.sub.4 = 1.56873                                                                           ν.sub.4 = 63.2                                 r.sub.7 = 48.592                                                                d.sub.7 = 6.3  n.sub.5 = 1.61293                                                                           ν.sub.5 = 37                                   r.sub.8 = -146.241                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 95.275                                                                d.sub.9 =  1.51                                                                               n.sub.6 = 1.80518                                                                           ν.sub.6 = 25.4                                 r.sub.10 = 42.377                                                               d.sub.10 = 8.00                                                                               n.sub.7 = 1.64328                                                                           ν.sub.7 = 47.9                                 r.sub.11 = -93.466                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 57.906                                                               d.sub.12 = 3.53                                                                               n.sub.8 = 1.72916                                                                           ν.sub.8 = 54.7                                 r.sub.13 = 81.621                                                               d.sub.13 = 5.73                                                               r.sub.14 = -46.913                                                              d.sub.14 = 2.04                                                                               n.sub.9 = 1.59551                                                                           ν.sub.9 = 39.2                                 r.sub.15 = 110.375                                                              d.sub.15 = 5.9                                                                r.sub.16 = 1179.425                                                             d.sub.16 = 4.5 n.sub.10 = 1.72916                                                                          ν.sub.10 = 54.7                                r.sub.17 = -49.279                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.55   6.315         37.574  24.17                                           147.63   27.39         16.5    45.426                                          193      42.525        1.364   60.381                                          F.sub.II = -0.714F.sub.W                                                                            F.sub.III = 0.825F.sub.W                                  r.sub.I-1 = 1.078F.sub.W                                                                            |r.sub.II | = 0.491F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.25512                                                    Δν.sub.I = 25.4                                  ______________________________________                                    

    ______________________________________                                         Embodiment 10                                                                  ______________________________________                                         r.sub.1 = 105.943                                                               d.sub.1 = 8.16 n.sub.1 = 1.641                                                                             ν.sub.1 = 56.9                                 r.sub.2 = -88.174                                                               d.sub.2 = 2.56 n.sub.2 = 1.6398                                                                            ν.sub.2 = 34.5                                 r.sub.3 = 413.942                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 592.383                                                               d.sub.4 = 1.58 n.sub.3 = 1.47069                                                                           ν.sub.3 = 67.4                                 r.sub.5 = 52.878                                                                d.sub.5 = 5.28                                                                r.sub.6 = -50.695                                                               d.sub.6 = 1.49 n.sub.4 = 1.56384                                                                           ν.sub.4 = 60.7                                 r.sub.7 = 58.485                                                                d.sub.7 = 6.39 n.sub.5 = 1.64769                                                                           ν.sub.5 = 33.8                                 r.sub.8 = -162.423                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 98.044                                                                d.sub.9 =  1.51                                                                               n.sub.6 = 1.78472                                                                           ν.sub.6 = 25.7                                 r.sub.10 = 41.174                                                               d.sub.10 = 8.01                                                                               n.sub.7 = 1.6393                                                                            ν.sub.7 = 44.9                                 r.sub.11 = -90.784                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 52.793                                                               d.sub.12 = 3.95                                                                               n.sub.8 = 1.617                                                                             ν.sub.8 = 62.8                                 r.sub.13 = 495.894                                                              d.sub.13 = 6.01                                                               r.sub.14 = -79.838                                                              d.sub.14 = 2.16                                                                               n.sub.9 = 1.5814                                                                            ν.sub.9 = 40.8                                 r.sub.15 = 61.776                                                               d.sub.15 = 7.38                                                               r.sub.16 = -93.198                                                              d.sub.16 = 5.59                                                                               n.sub.10 = 1.6516                                                                           ν.sub.10 = 58.7                                r.sub.17 = -47.068                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.57   5.641         37.314  6.823                                           147.62   26.716        16.24   27.897                                          193      41.851        1.104   43.032                                          F.sub. II = -0.714F.sub.W                                                                           F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 1.033F.sub.W                                                                            |r.sub.II | = 0.494F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.27585                                                    Δν.sub.I = 22.4                                  ______________________________________                                    

    ______________________________________                                         Embodiment 11                                                                  ______________________________________                                         r.sub.1 = 96.385                                                                d.sub.1 = 8.12 n.sub.1 = 1.6935                                                                            ν.sub.1 = 53.2                                 r.sub.2 = -147.812                                                              d.sub.2 = 2.54 n.sub.2 = 1.68893                                                                           ν.sub.2 = 31.1                                 r.sub.3 = 265.59                                                                d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -89.008                                                               d.sub.4 = 2.01 n.sub.3 = 1.72                                                                              ν.sub.3 = 46.0                                 r.sub.5 = 32.669                                                                d.sub.5 = 5.13 n.sub.4 = 1.80518                                                                           ν.sub.4 = 25.4                                 r.sub.6 = 94.807                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 65.425                                                                d.sub.7 = 1.46 n.sub.5 = 1.78472                                                                           ν.sub.5 = 25.7                                 r.sub.8 = 37.457                                                                d.sub.8 = 9.35 n.sub.6 = 1.51112                                                                           ν.sub.6 =  60.5                                r.sub.9 = -70.214                                                               d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 65.873                                                               d.sub.10 = 4.69                                                                               n.sub.7 = 1.6935                                                                            ν.sub.7 = 53.2                                 r.sub.11 = -155.394                                                             d.sub.11 = 6.72                                                               r.sub.12 = -43.123                                                              d.sub.12 = 1.57                                                                               n.sub.8 = 1.56444                                                                           ν.sub.8 = 43.8                                 r.sub.13 = 68.728                                                               d.sub.13 = 5.44                                                               r.sub.14 = -36.524                                                              d.sub.14 = 5.19                                                                               n.sub.9 = 1.72                                                                              ν.sub.9 = 50.3                                 r.sub.15 = -29.335                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.43   5.723         40.817  5.099                                           147.68   26.045        20.495  25.421                                          193      40.64         5.9     40.016                                          F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 0.941F.sub.W                                                                            |r.sub.II | = 0.869F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.35878                                                    Δν.sub.I = 22.1                                  ______________________________________                                    

    ______________________________________                                         Embodiment 12                                                                  ______________________________________                                         r.sub.1 = 90                                                                    d.sub.1 = 8.12 n.sub.1 = 1.72                                                                              ν.sub.1 = 50.3                                 r.sub.2 = -188.77                                                               d.sub.2 = 2.54 n.sub.2 = 1.72151                                                                           ν.sub.2 = 29.2                                 r.sub.3 = 211.414                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -88.728                                                               d.sub.4 = 2.01 n.sub.3 = 1.72                                                                              ν.sub.3 = 46.0                                 r.sub.5 = 32.722                                                                d.sub.5 = 5.1  n.sub.4 = 1.80518                                                                           ν.sub.4 = 25.4                                 r.sub.6 = 95.135                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 66.387                                                                d.sub.7 = 1.46 n.sub.5 = 1.7847                                                                            ν.sub.5 = 26.2                                 r.sub.8 = 37.268                                                                d.sub.8 = 12.28                                                                               n.sub.6 = 1.5112                                                                            ν.sub.6 = 60.5                                 r.sub.9 =  -67.633                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 87.09                                                                d.sub.10 = 6.66                                                                               n.sub.7 = 1.741                                                                             ν.sub.7 = 52.7                                 r.sub.11 = -126.453                                                             d.sub.11 = 6.36                                                               r.sub.12 = -40.681                                                              d.sub.12 = 2.58                                                                               n.sub.8 = 1.57501                                                                           ν.sub.8 = 41.5                                 r.sub.13 = 95.699                                                               d.sub.13 = 5.36                                                               r.sub.14 = -34.928                                                              d.sub.14 = 4.49                                                                               n.sub.9 = 1.757                                                                             ν.sub.9 = 47.9                                 r.sub.15 = -28.783                                                             F        D.sub.1       D.sub.2 D.sub.3                                         102.43   4.856         39.398  3.793                                           147.68   25.178        19.076  24.115                                          193      39.773        4.481   38.71                                           F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 0.879F.sub.W                                                                            |r.sub.II | = 0.866F.sub.W              Δ--N.sub.II + Δ --N.sub.III = 0.35878                                                   Δν.sub.I = 21.1                                  ______________________________________                                    

    ______________________________________                                         Embodiment 13                                                                  ______________________________________                                         r.sub.1 = 113.804                                                                        d.sub.1 = 8.12                                                                               n.sub.1 = 1.6935                                                                          ν.sub.1 = 53.2                           r.sub.2 = -112.521                                                                       d.sub.2 = 2.54                                                                               n.sub.2 = 1.6727                                                                          ν.sub.2 = 32.1                           r.sub.3 = 424.128                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -87.131                                                                        d.sub.4 = 2.01                                                                               n.sub.3 = 1.72                                                                            ν.sub.3 = 43.7                           r.sub.5 = 29.983                                                                         d.sub.5 = 5.73                                                                               n.sub.4 = 1.7847                                                                          ν.sub.4 = 26.2                           r.sub.6 = 99.986                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 64.722                                                                         d.sub.7 = 1.46                                                                               n.sub.5 = 1.72151                                                                         ν.sub.5 = 29.2                           r.sub.8 = 34.909                                                                         d.sub.8 = 9   n.sub.6 = 1.51112                                                                         ν.sub.6 =  60.5                          r.sub.9 = -74.582                                                                        d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 68.175                                                                        d.sub.10 = 4.22                                                                              n.sub.7 = 1.72916                                                                         ν.sub.7 = 54.7                           r.sub.11 = -179.302                                                                      d.sub.11 = 7.03                                                      r.sub.12 = -44.073                                                                       d.sub.12 = 1.74                                                                              n.sub.8 = 1.57309                                                                         ν.sub.8 = 42.6                           r.sub.13 = 65.55                                                                         d.sub.13 = 5.98                                                      r.sub.14 = -38.983                                                                       d.sub.14 = 4.94                                                                              n.sub.9 = 1.6935                                                                          ν.sub.9 = 53.2                           r.sub.15 = -29.562                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43    7.055        40.819   4.362                                          147.68   27.377        20.497  24.684                                          193      41.972         5.902  39.279                                          F.sub.II = -0.689F.sub.W                                                                          F.sub.III = 0.831F.sub.W                                    r.sub.I-1 = 1.111F.sub.W                                                                          |r.sub.II | = 0.851F.sub.W                Δ-- N.sub.II + Δ--N.sub.III = 0.27509                                                 Δν.sub.I = 21.1                                    ______________________________________                                    

    ______________________________________                                         Embodiment 14                                                                  ______________________________________                                         r.sub.1 = 112.359                                                                        d.sub.1 = 8.12                                                                               n.sub.1 = 1.6935                                                                          ν.sub.1 = 53.2                           r.sub.2 = -112                                                                           d.sub.2 = 2.54                                                                               n.sub.2 = 1.68893                                                                         ν.sub.2 = 31.1                           r.sub.3 = 452.529                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -93.072                                                                        d.sub.4 = 2.01                                                                               n.sub.3 = 1.72                                                                            ν.sub.3 = 46                             r.sub.5 = 30.606                                                                         d.sub.5 = 5.29                                                                               n.sub.4 = 1.80518                                                                         ν.sub.4 = 25.4                           r.sub.6 = 89.243                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 62.002                                                                         d.sub.7 = 1.46                                                                               n.sub.5 = 1.7847                                                                          ν.sub.5 26.2                             r.sub.8 = 35.748                                                                         d.sub.8 = 8.67                                                                               n.sub.6 = 1.51112                                                                         ν.sub.6 = 60.5                           r.sub.9 = -73.57                                                                         d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 58.62                                                                         d.sub.10 = 4.29                                                                              n.sub.7 = 1.741                                                                           ν.sub.7 = 52.7                           r.sub.11 = -450.663                                                                      d.sub.11 = 6.98                                                      r.sub.12 = -52.901                                                                       d.sub.12 = 1.79                                                                              n.sub.8 = 1.57501                                                                         ν.sub.8 = 41.5                           r.sub.13 = 55.615                                                                        d.sub.13 = 6.1                                                       r.sub.14 = -41.768                                                                       d.sub.14 = 5.36                                                                              n.sub.9 = 1.757                                                                           ν.sub.9 = 47.9                           r.sub.15 = -32.06                                                              ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43   6.883         41.409  3.978                                           147.68   27.205        21.087  24.3                                            193      41.8           6.492  38.895                                          F.sub.II = -0.689F.sub.W                                                                          F.sub.III = 0.831F.sub.W                                    r.sub.I-1 = 1.097F.sub.W                                                                          |r.sub.II | = 0.909F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.35878                                                  Δν.sub.I = 21.1                                    ______________________________________                                    

    ______________________________________                                         Embodiment 15                                                                  ______________________________________                                         r.sub.1 = 102.732                                                                        d.sub.1 = 5.8 n.sub.1 = 1.641                                                                           ν.sub.1 = 56.9                           r.sub.2 = -162.479                                                                       d.sub.2 = 2.3 n.sub.2 = 1.61293                                                                         ν.sub.2 = 37                             r.sub.3 = 361.524                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -83.421                                                                        d.sub.4 = 2.0 n.sub.3 = 1.62012                                                                         ν.sub.3 = 49.7                           r.sub.5 = 32.836                                                                         d.sub.5 = 4.0 n.sub.4 = 1.76182                                                                         ν.sub.4 = 26.6                           r.sub.6 = 71.388                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 121.646                                                                        d.sub.7 = 2.1 n.sub.5 = 1.69895                                                                         ν.sub.5 = 30.1                           r.sub.8 = 33.117                                                                         d.sub.8 = 7.3 n.sub.6 = 1.6583                                                                          ν.sub.6  = 57.3                          r.sub.9 = -88.167                                                                        d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 53.895                                                                        d.sub.10 = 4.4                                                                               n.sub.7 = 1.6485                                                                          ν.sub.7 = 53                             r.sub.11 = 365.658                                                                       d.sub.11 = 6.5                                                       r.sub.12 = -65.215                                                                       d.sub.12 = 2.5                                                                               n.sub.8 = 1.57957                                                                         ν.sub.8 = 53.8                           r.sub.13 = 71.468                                                                        d.sub.13 = 3.5                                                       r.sub.14 = -77.557                                                                       d.sub.14 = 3.5                                                                               n.sub.9 = 1.6485                                                                          ν.sub.9 = 53                             r.sub.15 = -41.329                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.21    5.861        38.303   7.685                                          150.42   26.861        17.303  28.685                                          193.98   40.861         3.303  42.685                                          F.sub.II = -0.696F.sub.W                                                                          F.sub.III = 0.822F.sub.W                                    r.sub.I-1 = 0.995F.sub.W                                                                          |r.sub.II | = 0.808F.sub.W                Δ-- N.sub.II + Δ--N.sub.III = 0.18235                                                 Δν.sub.I = 19.9                                    ______________________________________                                    

    ______________________________________                                         Embodiment 16                                                                  ______________________________________                                         r.sub.1 = 92.369                                                                         d.sub.1 = 5.18                                                                               n.sub.1 = 1.641                                                                           ν.sub.1 = 56.9                           r.sub.2 = -124.044                                                                       d.sub.2 = 2.09                                                                               n.sub.2 = 1.61293                                                                         ν.sub.2 = 37                             r.sub.3 = 319.244                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -79.057                                                                        d.sub.4 = 1.8 n.sub.3 = 1.6825                                                                          ν.sub.3 = 44.7                           r.sub.5 = 31.23                                                                          d.sub.5 = 4   n.sub.4 = 1.80518                                                                         ν.sub.4 = 25.4                           r.sub.6 = 76.086                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 116.231                                                                        d.sub.7 = 1.89                                                                               n.sub.5 = 1.74077                                                                         ν.sub.5 = 27.8                           r.sub.8 = 30.798                                                                         d.sub.8 = 7.5 n.sub.6 = 1.697                                                                           ν.sub.6  = 48.5                          r.sub.9 = -82.003                                                                        d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 65.384                                                                        d.sub.10 = 6.4                                                                               n.sub.7 = 1.6583                                                                          ν.sub.7 = 53.4                           r.sub.11 = 560.402                                                                       d.sub.11 = 9.47                                                      r.sub.12 = -58.027                                                                       d.sub.12 = 3.65                                                                              n.sub.8 = 1.57135                                                                         ν.sub.8 = 52.9                           r.sub.13 = 82.065                                                                        d.sub.13 = 4.5                                                       r.sub.14 = -76.837                                                                       d.sub.14 = 4.5                                                                               n.sub.9 = 1.6583                                                                          ν.sub.9 = 57.3                           r.sub.15 = -41.224                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.47    5.166        32.565   5.851                                          150.12   23.766        13.965  24.451                                          193      36.166         1.565  36.851                                          F.sub.II = -0.625F.sub.W                                                                          F.sub.III = 0.731F.sub.W                                    r.sub.I-1 = 0.893F.sub.W                                                                          |r.sub.II | = 0.764F.sub.W                Δ-- N.sub.II + Δ--N.sub.III = 0.16645                                                 Δν.sub.I = 19.9                                    ______________________________________                                    

    ______________________________________                                         Embodiment 17                                                                  ______________________________________                                         r.sub.1 = 84.518                                                                         d.sub.1 = 2.5 n.sub.1 = 1.6398                                                                          ν.sub.1 = 34.5                           r.sub.2 = 46                                                                             d.sub.2 = 5.74                                                                               n.sub.2 = 1.641                                                                           ν.sub.2 = 56.9                           r.sub.3 = 198.951                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -78.795                                                                        d.sub.4 = 2.13                                                                               n.sub.3 = 1.56883                                                                         ν.sub.3 = 56.1                           r.sub.5 = 36.692                                                                         d.sub.5 = 4.27                                                                               n.sub.4 = 1.78472                                                                         ν.sub.4 = 25.7                           r.sub.6 = 66.303                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 170.898                                                                        d.sub.7 = 2.67                                                                               n.sub.5 = 1.72825                                                                         ν.sub.5 = 28.5                           r.sub.8 = 36.304                                                                         d.sub.8 = 7.48                                                                               n.sub.6 = 1.697                                                                           ν.sub.6 =  48.5                          r.sub.9 = -89.32                                                                         d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 96.33                                                                         d.sub.10 = 4  n.sub.7 = 1.6516                                                                          ν.sub.7 = 58.7                           r.sub.11 = 249.545                                                                       d.sub.11 = 2.43                                                      r.sub.12 = -135.661                                                                      d.sub.12 = 4  n.sub.8 = 1.53256                                                                         ν.sub.8 = 45.9                           r.sub.13 = -255.847                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.28    4.908        43.74    8.179                                          150      26.961        21.687  30.232                                          193.59   41.761         6.887  45.032                                          F.sub.II = -0.73F.sub.W                                                                           F.sub.III = 0.877F.sub.W                                    r.sub.I-1 = 0.818F.sub.W                                                                          |r.sub.II | = 0.763F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.24714                                                  Δν.sub.I = 22.4                                    ______________________________________                                    

    ______________________________________                                         Embodiment 18                                                                  ______________________________________                                         r.sub.1 = 84.075                                                                         d.sub.1 = 6.2 n.sub.1 = 1.641                                                                           ν.sub.1 = 56.9                           r.sub.2 = -170.085                                                                       d.sub.2 = 2.3 n.sub.2 = 1.61293                                                                         ν.sub.2 = 37                             r.sub.3 = 190.102                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -75.21                                                                         d.sub.4 = 2   n.sub.3 = 1.57135                                                                         ν.sub.3 = 52.9                           r.sub.5 = 35.178                                                                         d.sub.5 = 4   n.sub.4 = 1.78472                                                                         ν.sub.4 = 25.7                           r.sub.6 = 64.055                                                                         d.sub.6 = D.sub.2 (variable)                                         r.sub.7 = 148.889                                                                        d.sub.7 = 2.2 n.sub.5 = 1.7285                                                                          ν.sub.5 = 28.5                           r.sub.8 = 34.759                                                                         d.sub.8 = 7.5 n.sub.6 = 1.697                                                                           ν.sub.6  = 48.5                          r.sub.9 = -90.578                                                                        d.sub.9 = D.sub.3 (variable)                                         r.sub.10 = 108.982                                                                       d.sub.10 = 3  n.sub.7 = 1.691                                                                           ν.sub.7 = 54.8                           r.sub.11 = 417.251                                                                       d.sub.11 = 1.97                                                      r.sub.12 = -135.649                                                                      d.sub.12 = 4.2                                                                               n.sub.8 = 1.53172                                                                         ν.sub.8 = 48.9                           r.sub.13 = -368.112                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.45    5.595        42.225  12.463                                          149.94   26.582        21.238  33.45                                           193      40.615         7.205  47.483                                          F.sub.II = -0.696F.sub.W                                                                          F.sub.III = 0.84F.sub.W                                     r.sub.I-1 = 0.813F.sub.W                                                                          |r.sub.II | = 0.727F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.24462                                                  Δν.sub.I = 19.9                                    ______________________________________                                    

In the above embodiments, reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.

Out of the above-mentioned embodiments, Embodiments 1 through 10 respectively have lens configuration as shown in FIG. 3, i.e., the first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, the second lens group II comprises a negative single lens and cemented doublet which consists of a negative lens element and positive lens element, the third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, and the fourth lens group IV comprises a positive lens, negative lens and positive meniscus lens. Embodiments 11 through 16 respectively have lens configuration as shown in FIG. 4, i.e., the second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element. Embodiments 17 and 18 respectively have lens configuration as shown in FIG. 5, i.e., the second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element, and the fourth lens group IV comprises a positive lens and negative lens. 

We claim:
 1. A bright and compact optical-compensation type zoom lens system comprising a first lens group I having positive refractive power, a second lens group II having negative refractive power, a third lens group III having positive refractive power, and a fourth lens group IV having positive refractive power, said zoom lens system being arranged to carry out zooming by keeping said second lens group II and said fourth lens group IV fixed and integrally moving said first lens group I and said third lens group III, said first lens group I comprising a cemented doublet consisting of a positive lens element and negative lens element, said second lens group II comprising at least one positive lens element and at least one negative lens element and comprising a cemented doublet having the surface on the object side thereof concave toward the object side, said third lens group III comprising a cemented doublet consisting of a positive lens element and negative lens element, said fourth lens group IV comprising at least one positive lens component and at least one negative lens component, said zoom lens system satisfying the following conditions (1) through (6):

    0.5F.sub.W <|F.sub.II |<1.0F.sub.W       ( 1)

    0.6F.sub.W <F.sub.III <1.5F.sub.W                          ( 2)

    0.6F.sub.W <r.sub.I-1 <2.0F.sub.W                          ( 3)

    0.4F.sub.W <|r.sub.II |<1.2F.sub.W       ( 4)

    ΔN.sub.II +ΔN.sub.III ≦0.4              (5)

    Δν.sub.I >15                                      (6)

wherein reference symbol F_(W) represents the shortest focal length of the lens system as a whole, reference symbol F_(II) represents the focal length of the second lens group II, reference symbol F_(III) represents the focal length of the third lens group III, reference symbol r_(I-1) represents the radius of curvature of the surface on the object side of the first lens group I, reference symbol r_(II) represents the radius of curvature of the surface on the object side of the cemented doublet constituting the second lens group II, reference symbol ΔN_(II) represents the difference between the mean value N'_(II) of refractive indices of positive lenses constituting the second lens group II and mean value N"_(II) of refractive indices of negative lenses constituting the second lens group II, reference symbol ΔN_(III) represents the difference between the mean value N"_(III) of refractive indices of negative lenses constituting the third lens group III and mean value N'_(III) of refractive indices of positive lenses constituting the third lens group III, and reference symbol Δν_(I) represents the value obtained by subtracting the Abbe's number ν"_(I) of the negative lens constituting the first lens group I from the Abbe's number ν'_(I) of the positive lens constituting the first lens group I.
 2. A bright and compact optical-compensation type zoom lens system according to claim 1 further satisfying the following condition (7):

    0.6<|r.sub.III-1 /r.sub.III-2 |<2.5      (7)

wherein reference symbols r_(III-1) and r_(III-2) respectively represent radii of curvature of the surface on the object side and cemented surface of the cemented doublet constituting the third lens group III.
 3. A bright and compact optical-compensation type zoom lens system according to claim 2 further satisfying the following condition (8):

    |r.sub.I-2 |>0.4F.sub.W                  ( 8)

wherein reference symbol r_(I-2) represents the radius of curvature of the cemented surface of the cemented doublet constituting the first lens group I.
 4. A bright and compact optical-compensation type zoom lens system according to claim 3 further satisfying the following conditions (9) and (10):

    N.sub.IV >1.5                                              (9)

    N.sub.I >1.5                                               (10)

wherein reference symbol N_(I) represents the mean value of refractive indices of respective lenses constituting the first lens group I, and reference symbol N_(IV) represents the mean value of refractive indices of respective lenses constituting the fourth lens group IV.
 5. A bright and compact optical-compensation type zoom lens system according to claim 1, in which said first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, said second lens group II comprises a negative lens component and a cemented doublet consisting of a negative lens element and positive lens element, said third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, and said fourth lens group IV comprises a positive lens component, negative lens component and positive lens component.
 6. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 106.068                                                                        d.sub.1 = 8.16                                                                               n.sub.1 = 1.63854                                                                         ν.sub.1 = 55.4                           r.sub.2 = -89.917                                                                        d.sub.2 = 2.56                                                                               n.sub.2 = 1.6398                                                                          ν.sub.2 = 34.5                           r.sub.3 = 430.595                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = 630.592                                                                        d.sub.4 = 1.58                                                                               n.sub.3 = 1.47069                                                                         ν.sub.3 = 67.4                           r.sub.5 = 53.66                                                                          d.sub.5 = 5.28                                                       r.sub.6 = -51.723                                                                        d.sub.6 = 1.49                                                                               n.sub.4 = 1.56873                                                                         ν.sub.4 = 63.2                           r.sub.7 = 57.981                                                                         d.sub.7 = 6.4 n.sub.5 = 1.64769                                                                         ν.sub.5 = 33.8                           r.sub.8 = -167.369                                                                       d.sub.8 = D.sub.2 (variable)                                         r.sub.9 = 97.414                                                                         d.sub.9 = 1.51                                                                               n.sub.6 = 1.80518                                                                         ν.sub.6 = 25.4                           r.sub.10 = 42.127                                                                        d.sub.10 = 7.99                                                                              n.sub.7 = 1.64328                                                                         ν.sub.7 = 47.9                           r.sub.11 = -90.745                                                                       d.sub.11 = D.sub.3 (variable)                                        r.sub.12 = 53.361                                                                        d.sub.12 = 3.89                                                                              n.sub.8 = 1.617                                                                           ν.sub.8 = 62.8                           r.sub.13 = 2063.483                                                                      d.sub.13 = 5.93                                                      r.sub.14 = -72.391                                                                       d.sub.14 = 2.09                                                                              n.sub.9 = 1.56732                                                                         ν.sub.9 = 42.8                           r.sub.15 = 59.667                                                                        d.sub.15 = 7.4                                                       r.sub.16 = -75.87                                                                        d.sub.16 = 5.74                                                                              n.sub.10 = 1.6516                                                                         ν.sub.10 = 58.7                          r.sub.17 = -43.246                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.57    5.616        37.409   6.759                                          147.62   26.691        16.335  27.833                                          193      41.826         1.199  42.968                                          F.sub.II  = -0.714F.sub.W                                                                         F.sub.III = 0.86F.sub.W                                     r.sub.I-1 = 1.034F.sub.W                                                                          |r.sub.II | = 0.504F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.28988                                                  Δν.sub.I = 20.9                                    ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 7. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 105.22                                                                         d.sub.1 = 8.27                                                                               n.sub.1 = 1.6935                                                                          ν.sub.1 = 53.2                           r.sub.2 = -116.871                                                                       d.sub.2 = 2.56                                                                               n.sub.2 = 1.6727                                                                          ν.sub.2 = 32.1                           r.sub.3 = 294.901                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = 459.551                                                                        d.sub.4 = 1.58                                                                               n.sub.3 = 1.47069                                                                         ν.sub.3 = 67.4                           r.sub.5 = 55.4                                                                           d.sub.5 = 5.29                                                       r.sub.6 = -49.782                                                                        d.sub.6 = 1.49                                                                               n.sub.4 = 1.56873                                                                         ν.sub.4 = 63.2                           r.sub.7 = 68.045                                                                         d.sub.7 = 6.33                                                                               n.sub.5 = 1.6398                                                                          ν.sub.5 = 34.5                           r.sub.8 = -157.932                                                                       d.sub.8 = D.sub.2 (variable)                                         r.sub.9 = 100.383                                                                        d.sub.9 = 1.51                                                                               n.sub.6 = 1.80518                                                                         ν.sub.6 = 25.4                           r.sub.10 = 45.145                                                                        d.sub.10 = 8.13                                                                              n.sub.7 = 1.64328                                                                         ν.sub.7 = 47.9                           r.sub.11 = -90.856                                                                       d.sub.11 = D.sub.3 (variable)                                        r.sub.12 = 51.818                                                                        d.sub.12 = 4.54                                                                              n.sub.8 = 1.6935                                                                          ν.sub.8 = 53.2                           r.sub.13 = 127.254                                                                       d.sub.13 = 7.1                                                       r.sub.14 = -283.406                                                                      d.sub.14 = 2.78                                                                              n.sub.9 = 1.59551                                                                         ν.sub.9 = 39.2                           r.sub.15 = 53.47                                                                         d.sub.15 = 8.59                                                      r.sub.16 = 361.809                                                                       d.sub.16 = 6.61                                                                              n.sub.10 = 1.6935                                                                         ν.sub.10 = 53.2                          r.sub.17 = -161.703                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.58    4.714        37.563   3.119                                          147.62   25.789        16.489  24.193                                          193      40.924         1.353  39.328                                          F.sub.II =  -0.714F.sub.W                                                                         F.sub.III = 0.86F.sub.W                                     r.sub.I-1 = 1.026F.sub.W                                                                          |r.sub.II | = 0.485F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.28199                                                  Δν.sub.I = 21.1                                    ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 8. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 83.719                                                                           d.sub.1 = 7.8                                                                             n.sub.1 = 1.60311                                                                          ν.sub.1 = 60.7                           r.sub.2 = -178.01                                                                          d.sub.2 = 2.49                                                                            n.sub.2 = 1.59551                                                                          ν.sub.2 = 39.2                           r.sub.3 = 213.01                                                                           d.sub.3 = D.sub.1                                                              (variable)                                                         r.sub.4 = 127.605                                                                          d.sub.4 = 1.58                                                                            n.sub.3 = 1.47069                                                                          ν.sub.3 = 67.4                           r.sub.5 = 50.027                                                                           d.sub.5 = 5.63                                                     r.sub.6 = -52.717                                                                          d.sub.6 = 1.49                                                                            n.sub.4 = 1.56873                                                                          ν.sub.4 = 63.2                           r.sub.7 = 76.081                                                                           d.sub.7 = 6.3                                                                             n.sub.5 = 1.68893                                                                          ν.sub.5 = 31.1                           r.sub.8 = -516.424                                                                         d.sub.8 = D.sub.2                                                              (variable)                                                         r.sub.9 = 95.301                                                                           d.sub.9 = 1.51                                                                            n.sub.6 = 1.80518                                                                          ν.sub.6 = 25.4                           r.sub.10 = 44.296                                                                          d.sub.10 = 8.23                                                                           n.sub.7 = 1.62299                                                                          ν.sub.7 = 58.1                           r.sub.11 = -86.766                                                                         d.sub.11 = D.sub.3                                                             (variable)                                                         r.sub.12 = 45.454                                                                          d.sub.12 = 4.71                                                                           n.sub.8 = 1.72                                                                             ν.sub.8 = 46                             r.sub.13 = 105.219                                                                         d.sub.13 = 9.32                                                    r.sub.14 = -2263.939                                                                       d.sub.14 = 3.22                                                                           n.sub.9 = 1.66755                                                                          ν.sub.9 = 41.9                           r.sub.15 = 43.134                                                                          d.sub.15 = 9.05                                                    r.sub.16 = 95.423                                                                          d.sub.16 = 4.43                                                                           n.sub.10 = 1.62012                                                                         ν.sub.10 = 49.7                          r.sub.17 = -2903.76                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.71    1.879        39.428  13.804                                          147.8    22.954        18.354  34.878                                          193.23   38.089         3.218  50.013                                          F.sub.II =  -0.713F.sub.W                                                                         F.sub.III = 0.859F.sub.W                                    r.sub.I-1 = 0.815F.sub.W                                                                          |r.sub.II | = 0.513F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.35141                                                  Δν.sub.I = 21.5                                    ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 9. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 89.93                                                                          d.sub.1 = 2.49                                                                               n.sub.1 = 1.64769                                                                         ν.sub.1 = 33.8                           r.sub.2 = 47.682                                                                         d.sub.2 = 6.74                                                                               n.sub.2 = 1.6516                                                                          ν.sub.2 = 58.7                           r.sub.3 = 231.179                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -266                                                                           d.sub.4 = 1.58                                                                               n.sub.3 = 1.51633                                                                         ν.sub.3 = 64.2                           r.sub.5 = 74.861                                                                         d.sub.5 = 5.23                                                       r.sub.6 = -51.543                                                                        d.sub.6 = 1.58                                                                               n.sub.4 = 1.691                                                                           ν.sub.4 = 54.8                           r.sub.7 = 129.457                                                                        d.sub.7 = 4.88                                                                               n.sub.5 = 1.68893                                                                         ν.sub.5 = 31.1                           r.sub.8 = -84.447                                                                        d.sub.8 = D.sub.2 (variable)                                         r.sub.9 = 157.408                                                                        d.sub.9 = 1.51                                                                               n.sub.6 = 1.7847                                                                          ν.sub.6 = 26.2                           r.sub.10 = 48.608                                                                        d.sub.10 = 7.36                                                                              n.sub.7 = 1.72                                                                            ν.sub.7 = 50.3                           r.sub.11 = -91.938                                                                       d.sub.11 = D.sub.3 (variable)                                        r.sub.12 = 57.692                                                                        d.sub.12 = 5.19                                                                              n.sub.8 = 1.6968                                                                          ν.sub.8 = 55.5                           r.sub.13 = 171.955                                                                       d.sub.13 = 8.55                                                      r.sub.14 = -131.619                                                                      d.sub.14 = 3.11                                                                              n.sub.9 = 1.57501                                                                         ν.sub.9 = 41.5                           r.sub.15 = 68.064                                                                        d.sub.15 = 8.8                                                       r.sub.16 = 1663.829                                                                      d.sub.16 = 5.19                                                                              n.sub.10 = 1.67                                                                           ν.sub.10 = 51.6                          r.sub.17 = -124.903                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.58    6.698        36.823  14.306                                          147.62   27.773        15.749  35.38                                           193      42.908         0.613  50.515                                          F.sub.II = - 0.714F.sub.W                                                                         F.sub.III = 0.86F.sub.W                                     r.sub.I-1 = 0.877F.sub.W                                                                          |r.sub.II | = 0.502F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.14997                                                  Δν.sub.I = 24.9                                    ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvative of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 10. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 133.067                                                                        d.sub.1 = 3.00                                                                               n.sub.1 = 1.64769                                                                         ν.sub.1 = 33.8                           r.sub.2 = 65.29                                                                          d.sub.2 = 6.00                                                                               n.sub.2 = 1.6516                                                                          ν.sub.2 = 58.7                           r.sub.3 = 562.205                                                                        d.sub.3 = D.sub.1 (variable)                                         r.sub.4 = -217.465                                                                       d.sub.4 = 2.00                                                                               n.sub.3 = 1.51633                                                                         ν.sub.3 = 64.2                           r.sub.5 = 105.496                                                                        d.sub.5 = 4.00                                                       r.sub.6 = -76.869                                                                        d.sub.6 = 2.00                                                                               n.sub.4 = 1.691                                                                           ν.sub.4 = 54.8                           r.sub.7 = 120.854                                                                        d.sub.7 = 4.81                                                                               n.sub.5 = 1.68893                                                                         ν.sub.5 = 31.1                           r.sub.8 = -130.195                                                                       d.sub.8 = D.sub.2 (variable)                                         r.sub.9 = 174.709                                                                        d.sub.9 = 1.92                                                                               n.sub.6 = 1.78472                                                                         ν.sub.6 = 25.7                           r.sub.10 = 66.198                                                                        d.sub.10 = 8.00                                                                              n.sub.7 = 1.691                                                                           ν.sub.7 = 54.8                           r.sub.11 = -115.764                                                                      d.sub.11 = D.sub.3 (variable)                                        r.sub.12 = 34.949                                                                        d.sub.12 = 5.05                                                                              n.sub.8 = 1.63854                                                                         ν.sub.8 = 55.4                           r.sub.13 = 88.396                                                                        d.sub.13 = 5.72                                                      r.sub.14 = -336.049                                                                      d.sub.14 = 3.4                                                                               n.sub.9 = 1.56732                                                                         ν.sub.9 = 42.8                           r.sub.15 = 35.326                                                                        d.sub.15 = 5.89                                                      r.sub.16 = 267.612                                                                       d.sub.16 = 5.45                                                                              n.sub.10 = 1.62299                                                                        ν.sub.10 = 58.1                          r.sub.17 = -112.548                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.69   2.6           48.162  24.166                                          144.97   27.831        22.931  49.397                                          193.4    48.533         2.229  70.099                                          F.sub.II =  -0.905F.sub.W                                                                         F.sub.III = 1.09F.sub.W                                     r.sub.I-1 = 1.296F.sub.W                                                                          |r.sub.II | = 0.749F.sub.W                Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                  Δν.sub.I = 24.9                                    ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂ , . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 11. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 112.279                                                               d.sub.1 = 3.00  n.sub.1 = 1.64769                                                                          ν.sub.1 = 33.8                                 r.sub.2 = 65.37                                                                 d.sub.2 = 6.00  n.sub.2 = 1.6516                                                                           ν.sub.2 = 58.7                                 r.sub.3 = 310.971                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -303.957                                                              d.sub.4 = 2.00  n.sub.3 = 1.51633                                                                          ν.sub.3 = 64.2                                 r.sub.5 = 95.796                                                                d.sub.5 = 4.00                                                                r.sub.6 = -72.999                                                               d.sub.6 = 2.00  n.sub.4 = 1.691                                                                            ν.sub.4 = 54.8                                 r.sub.7 = 120.852                                                               d.sub.7 = 4.81  n.sub.5 = 1.68893                                                                          ν.sub.5 = 31.1                                 r.sub.8 = -123.895                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 173.609                                                               d.sub.9 = 1.92  n.sub.6 = 1.78472                                                                          ν.sub.6 = 25.7                                 r.sub.10 = 59.603                                                               d.sub.10 = 8.00 n.sub.7 = 1.691                                                                            ν.sub.7 = 54.8                                 r.sub.11 = -113.364                                                             d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 32.184                                                               d.sub.12 = 5.05 n.sub.8 = 1.63854                                                                          ν.sub.8 = 55.4                                 r.sub.13 = 62.499                                                               d.sub.13 = 5.72                                                               r.sub.14 = -2741.179                                                            d.sub.14 = 3.4  n.sub.9 = 1.56732                                                                          ν.sub.9 = 42.8                                 r.sub.15 = 32.061                                                               d.sub.15 = 5.89                                                               r.sub.16 = 87.089                                                               d.sub.16 = 5.45 n.sub.10 = 1.61484                                                                         ν.sub.10 = 51.2                                r.sub.17 = -270.876                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.69    1.255        48.139  24.332                                          144.97   26.486        22.908  49.563                                          193.4    47.188         2.206  70.265                                          ______________________________________                                         F.sub.II =  -0.905F.sub.W                                                                           F.sub.III = 1.09F.sub.W                                   r.sub.I-1 = 1.093F.sub.W                                                                            |r.sub.II | = 0.711F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 12. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 132.817                                                               d.sub.1 = 3.00  n.sub.1 = 1.64769                                                                          ν.sub.1 = 33.8                                 r.sub.2 = 65.29                                                                 d.sub.2 = 6.00  n.sub.2 = 1.6516                                                                           ν.sub.2 = 58.7                                 r.sub.3 = 557.645                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -229.584                                                              d.sub.4 = 2.00  n.sub.3 = 1.56873                                                                          ν.sub.3 = 63.2                                 r.sub.5 = 110.963                                                               d.sub.5 = 4.00                                                                r.sub.6 = -73.683                                                               d.sub.6 = 2.00  n.sub.4 = 1.755                                                                            ν.sub.4 = 52.3                                 r.sub.7 = 434.45                                                                d.sub.7 = 5.00  n.sub.5 = 1.7552                                                                           ν.sub.5 = 27.5                                 r.sub.8 = -112.23                                                               d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 176.246                                                               d.sub.9 = 1.92  n.sub.6 =  1.78472                                                                         ν.sub.6 = 25.7                                 r.sub.10 = 65.907                                                               d.sub.10 = 8.00 n.sub.7 = 1.6935                                                                           ν.sub.7 = 53.2                                 r.sub.11 = -116.042                                                             d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 36.32                                                                d.sub.12 = 5.05 n.sub.8 = 1.63854                                                                          ν.sub.8 = 55.4                                 r.sub.13 = 108.169                                                              d.sub.13 = 5.72                                                               r.sub.14 = -243.74                                                              d.sub.14 = 3.4  n.sub.9 = 1.56732                                                                          ν.sub.9 = 42.8                                 r.sub.15 = 36.744                                                               d.sub.15 = 5.89                                                               r.sub.16 = 1812.39                                                              d.sub.16 = 5.45 n.sub.10 = 1.62299                                                                         ν.sub.10 = 58.1                                r.sub.17  = -90.179                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.69    3.249        47.493  24.121                                          144.97   28.48         22.262  49.352                                          193.4    49.182        1.56    70.054                                          ______________________________________                                         F.sub.II =  -0.905F.sub.W                                                                           F.sub.III = 1.09F.sub.W                                   r.sub.I-1 = 1.293F.sub.W                                                                            |r.sub.II | = 0.718F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.17899                                                    Δν.sub.I = 24.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 13. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 83.643                                                                d.sub.1 = 6.74  n.sub.1 = 1.6516                                                                           ν.sub.1 = 58.7                                 r.sub.2 = -212.523                                                              d.sub.2 = 2.49  n.sub.2 = 1.64769                                                                          ν.sub.2 = 33.8                                 r.sub.3 = 191.847                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -315.514                                                              d.sub.4 = 1.58  n.sub.3 = 1.51633                                                                          ν.sub.3 = 64.2                                 r.sub.5 = 73.972                                                                d.sub.5 = 5.23                                                                r.sub.6 = -50.788                                                               d.sub.6 = 1.58  n.sub.4 = 1.691                                                                            ν.sub.4 = 54.8                                 r.sub.7 = 129.475                                                               d.sub.7 = 4.88  n.sub.5 = 1.68893                                                                          ν.sub.5 = 31.1                                 r.sub.8 = -84.647                                                               d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 154.659                                                               d.sub.9 = 1.51  n.sub.6 = 1.78472                                                                          ν.sub.6 = 25.7                                 r.sub.10 = 45.712                                                               d.sub.10 = 7.36 n.sub.7 = 1.717                                                                            ν.sub.7 = 47.9                                 r.sub.11 = -90.848                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 54.9                                                                 d.sub.12 = 5.19 n.sub.8 = 1.6935                                                                           ν.sub.8 = 53.2                                 r.sub.13 = 136.19                                                               d.sub.13 = 8.55                                                               r.sub.14 = -180.558                                                             d.sub.14 = 3.11 n.sub.9 = 1.60717                                                                          ν.sub.9 = 40.3                                 r.sub.15 = 62.987                                                               d.sub.15 = 8.8                                                                r.sub.16 = 206.328                                                              d.sub.16 = 5.15 n.sub.10 = 1.697                                                                           ν.sub.10 = 48.5                                r.sub.17 = -227.955                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.58    5.936        36.92   14.577                                          147.62   27.011        15.846  35.651                                          193      42.146        0.71    50.786                                          ______________________________________                                         F.sub.II = - 0.714F.sub.W                                                                           F.sub.III = 0.86F.sub.W                                   r.sub.I-1  = 0.815F.sub.W                                                                           |r.sub.II | = 0.495F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 1.5299                                                     Δν.sub.I = 24.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 14. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 110.546                                                               d.sub.1 = 8.00  n.sub.1 = 1.60311                                                                          ν.sub.1 = 60.7                                 r.sub.2 = -109.204                                                              d.sub.2 = 2.49  n.sub.2 = 1.5927                                                                           ν.sub.2 = 35.3                                 r.sub.3 = 589.506                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 531.834                                                               d.sub.4 = 1.58  n.sub.3 = 1.47069                                                                          ν.sub.3 = 67.4                                 r.sub.5 = 55.243                                                                d.sub.5 =  5.23                                                               r.sub.6 = -50.403                                                               d.sub.6 = 1.49  n.sub.4 = 1.56873                                                                          ν.sub.4 = 63.2                                 r.sub.7 = 48.592                                                                d.sub.7 = 6.3   n.sub.5 = 1.61293                                                                          ν.sub.5 = 37                                   r.sub.8 = -146.241                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 95.275                                                                d.sub.9 = 1.51  n.sub.6 = 1.80518                                                                          ν.sub.6 = 25.4                                 r.sub.10 = 42.377                                                               d.sub.10 = 8.00 n.sub.7 = 1.64328                                                                          ν.sub.7 = 47.9                                 r.sub.11 = -93.466                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 57.906                                                               d.sub.12 = 3.53 n.sub.8 = 1.72916                                                                          ν.sub.8 = 54.7                                 r.sub.13 = 81.621                                                               d.sub.13 = 5.73                                                               r.sub.14 = -46.913                                                              d.sub.14 = 2.04 n.sub.9 = 1.59551                                                                          ν.sub.9 = 39.2                                 r.sub.15 = 110.375                                                              d.sub.15 = 5.9                                                                r.sub.16 =  1179.425                                                            d.sub.16 = 4.5  n.sub.10 = 1.72916                                                                         ν.sub.10 = 54.7                                r.sub.17 = -49.279                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.55    6.315        37.547  24.17                                           147.63   27.39         16.5    45.426                                          193      42.525         1.364  60.381                                          ______________________________________                                         F.sub.II = -0.714F.sub.W                                                                            F.sub.III = 0.852F.sub.W                                  r.sub.I-1 = 1.078F.sub.W                                                                            |r.sub.II | = 0.491F.sub.W              Δ --N.sub.II + Δ--N.sub.III = 0.25512                                                   Δν.sub.I = 25.4                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 15. A bright and compact optical-compensation type zoom lens system according to claim 5, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 105.943                                                               d.sub.1 = 8.16  n.sub.1 = 1.641                                                                            ν.sub.1 = 56.9                                 r.sub.2 = -88.174                                                               d.sub.2 = 2.56  n.sub.2 = 1.6398                                                                           ν.sub.2 = 34.5                                 r.sub.3 = 413.942                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = 592.383                                                               d.sub.4 = 1.58  n.sub.3 = 1.47069                                                                          ν.sub.3 = 67.4                                 r.sub.5 = 52.878                                                                d.sub.5 = 5.28                                                                r.sub.6 = -50.695                                                               d.sub.6 = 1.49  n.sub.4 = 1.56384                                                                          ν.sub.4 = 60.7                                 r.sub.7 = 58.485                                                                d.sub.7 = 6.39  n.sub.5 = 1.64769                                                                          ν.sub.5 = 33.8                                 r.sub.8 = -162.423                                                              d.sub.8 = D.sub.2 (variable)                                                  r.sub.9 = 98.044                                                                d.sub.9 = 1.51  n.sub.6 = 1.78472                                                                          ν.sub.6  = 25.7                                r.sub.10 = 41.174                                                               d.sub.10 = 8.01 n.sub.7 = 1.6393                                                                           ν.sub.7 = 44.9                                 r.sub.11 = -90.784                                                              d.sub.11 = D.sub.3 (variable)                                                 r.sub.12 = 52.793                                                               d.sub.12 = 3.95 n.sub.8 = 1.617                                                                            ν.sub.8 = 62.8                                 r.sub.13 = 495.894                                                              d.sub.13 = 6.01                                                               r.sub.14 = -79.838                                                              d.sub.14 = 2.16 n.sub.9 = 1.5814                                                                           ν.sub.9 = 40.8                                 r.sub.15 = 61.776                                                               d.sub.15 = 7.38                                                               r.sub.16 = -93.198                                                              d.sub.16 = 5.59 n.sub.10 = 1.6516                                                                          ν.sub.10 = 58.7                                r.sub.17 = -47.068                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.57    5.641        37.314   6.823                                          147.62   26.716        16.24   27.897                                          193      41.851         1.104  43.032                                          ______________________________________                                         F.sub.II = -0.714F.sub.W                                                                            F.sub.III = 0.86F.sub.W                                   r.sub.I-1 = 1.033F.sub.W                                                                            |r.sub.II | = 0.494F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.27585                                                    Δν.sub.I = 22.4                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 16. A bright and compact optical-compensation type zoom lens system according to claim 1, in which said first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, said second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element, said third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, said fourth lens group IV comprises a positive lens component, negative lens component and positive lens component.
 17. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 96.385                                                                d.sub.1 = 8.12  n.sub.1 = 1.6935                                                                           ν.sub.1 = 53.2                                 r.sub.2 = -147.812                                                              d.sub.2 = 2.54  n.sub.2 = 1.68893                                                                          ν.sub.2 = 31.1                                 r.sub.3 = 265.59                                                                d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -89.008                                                               d.sub.4 = 2.01  n.sub.3 = 1.72                                                                             ν.sub.3 = 46.0                                 r.sub.5 = 32.669                                                                d.sub.5 = 5.13  n.sub.4 = 1.80518                                                                          ν.sub.4 = 25.4                                 r.sub.6 = 94.807                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 65.425                                                                d.sub.7 = 1.46  n.sub.5 = 1.78472                                                                          ν.sub.5 = 25.7                                 r.sub.8 = 37.457                                                                d.sub.8 = 9.35  n.sub.6 = 1.51112                                                                          ν.sub.6 = 60.5                                 r.sub.9 =  -70.214                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 65.873                                                               d.sub.10 = 4.69 n.sub.7 = 1.6935                                                                           ν.sub.7 = 53.2                                 r.sub.11 = -155.394                                                             d.sub.11 = 6.72                                                               r.sub.12 = -43.123                                                              d.sub.12 = 1.57 n.sub.8 = 1.56444                                                                          ν.sub.8 = 43.8                                 r.sub.13 = 68.728                                                               d.sub.13 = 5.44                                                               r.sub.14 = -36.524                                                              d.sub.14 = 5.19 n.sub.9 = 1.72                                                                             ν.sub.9 = 50.3                                 r.sub.15 = -29.335                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43    5.723        40.817   5.099                                          147.68   26.045        20.495  25.421                                          193      40.64         5.9     40.016                                          ______________________________________                                         F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 0.941F.sub.W                                                                            |r.sub.II | = 0.869F.sub.W              Δ--N.sub.II +  Δ--N.sub.III = 0.35878                                                   Δν.sub.I = 22.1                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as whole.
 18. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 90                                                                    d.sub.1 = 8.12  n.sub.1 = 1.72                                                                             ν.sub.1 = 50.3                                 r.sub.2 = -188.77                                                               d.sub.2 = 2.54  n.sub.2 = 1.72151                                                                          ν.sub.2 = 29.2                                 r.sub.3 = 211.414                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -88.728                                                               d.sub.4 = 2.01  n.sub.3 = 1.72                                                                             ν.sub.3 = 46.0                                 r.sub.5 = 32.722                                                                d.sub.5 = 5.1   n.sub.4 = 1.80518                                                                          ν.sub.4 = 25.4                                 r.sub.6 = 95.135                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 66.387                                                                d.sub.7 = 1.46  n.sub.5 = 1.7847                                                                           ν.sub.5 = 26.2                                 r.sub.8 = 37.268                                                                d.sub.8 = 12.28 n.sub.6 = 1.5112                                                                           ν.sub.6 = 60.5                                 r.sub.9 =  -67.633                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 87.09                                                                d.sub.10 = 6.66 n.sub.7 = 1.741                                                                            ν.sub.7 = 52.7                                 r.sub.11 = -126.453                                                             d.sub.11 = 6.36                                                               r.sub.12 = -40.681                                                              d.sub.12 = 2.58 n.sub.8 = 1.57501                                                                          ν.sub.8 = 41.5                                 r.sub.13 = 95.699                                                               d.sub.13 = 5.36                                                               r.sub.14 = -34.928                                                              d.sub.14 = 4.49 n.sub.9 = 1.757                                                                            ν.sub.9 = 47.9                                 r.sub.15 = -28.783                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43    4.856        39.398   3.793                                          147.68   25.178        19.076  24.115                                          193      39.773         4.481  38.71                                           ______________________________________                                         F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 0.879F.sub.W                                                                            |r.sub.II | = 0.866F.sub.W              Δ--N.sub.II  + Δ--N.sub.III = 0.35878                                                   Δν.sub.I = 21.1                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represent the focal length of the lens system as a whole.
 19. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 113.804                                                               d.sub.1 = 8.12  n.sub.1 = 1.6935                                                                           ν.sub.1 = 53.2                                 r.sub.2 = -112.521                                                              d.sub.2 = 2.54  n.sub.2 = 1.6727                                                                           ν.sub.2 = 32.1                                 r.sub.3 = 424.128                                                               d.sub.2 = D.sub.1 (variable)                                                  r.sub.4 = -87.131                                                               d.sub.4 = 2.01  n.sub.3 = 1.72                                                                             ν.sub.3 = 43.7                                 r.sub.5 = 29.983                                                                d.sub.5 = 5.73  n.sub.4 = 1.7847                                                                           ν.sub.4 = 26.2                                 r.sub.6 = 99.986                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 64.722                                                                d.sub.7 = 1.46  n.sub.5 = 1.72151                                                                          ν.sub.5 = 29.2                                 r.sub.8 = 34.909                                                                d.sub.8 = 9     n.sub.6 = 1.51112                                                                          ν.sub.6 = 60.5                                 r.sub.9 =  -74.582                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 68.175                                                               d.sub.10 = 4.22 n.sub.7 = 1.72916                                                                          ν.sub.7 = 54.7                                 r.sub.11 = -179.302                                                             d.sub.11 = 7.03                                                               r.sub.12 = -44.073                                                              d.sub.12 = 1.74 n.sub.8 = 1.57309                                                                          ν.sub.8 = 42.6                                 r.sub.13 = 65.55                                                                d.sub.13 = 5.98                                                               r.sub.14 = -38.983                                                              d.sub.14  = 4.94                                                                               n.sub.9 = 1.6935                                                                           ν.sub.9 = 53.2                                 r.sub.15 = -29.562                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43    7.055        40.819   4.362                                          147.68   27.377        20.497  24.684                                          193      41.972         5.902  39.279                                          ______________________________________                                         F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 1.111F.sub.W                                                                            |r.sub.II | = 0.851F.sub.W              Δ--N.sub.II +  Δ--N.sub.III = 0.27509                                                   Δν.sub.I = 21.1                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 20. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 112.359                                                               d.sub.1 = 8.12  n.sub.1 = 1.6935                                                                           ν.sub.1 = 53.2                                 r.sub.2 = -112                                                                  d.sub.2 = 2.54  n.sub.2 = 1.68893                                                                          ν.sub.2 = 31.1                                 r.sub.3 = 452.529                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -93.072                                                               d.sub.4 = 2.01  n.sub.3 = 1.72                                                                             ν.sub.3 = 46                                   r.sub.5 = 30.606                                                                d.sub.5 = 5.29  n.sub.4 = 1.80518                                                                          ν.sub.4 = 25.4                                 r.sub.6 = 89.243                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 62.002                                                                d.sub.7 = 1.46  n.sub.5 = 1.7847                                                                           ν.sub.5 = 26.2                                 r.sub.8 = 35.748                                                                d.sub.8 = 8.67  n.sub.6 = 1.51112                                                                          ν.sub.6 = 60.5                                 r.sub.9 = -73.57                                                                d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 58.62                                                                d.sub.10 = 4.29 n.sub.7 = 1.741                                                                            ν.sub.7 = 52.7                                 r.sub.11 = -450.663                                                             d.sub.11 = 6.98                                                               r.sub.12 = -52.901                                                              d.sub.12 = 1.79 n.sub.8 = 1.57501                                                                          ν.sub.8 = 41.5                                 r.sub.13 = 55.615                                                               d.sub.13 = 6.1                                                                r.sub.14 = -41.768                                                              d.sub.14 = 5.36 n.sub.9 = 1.757                                                                            ν.sub.9 = 47.9                                 r.sub.15 = -32.06                                                              ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         102.43    6.883        41.409  3.978                                           147.68   27.205        21.087  24.3                                            193      41.8           6.492  38.895                                          ______________________________________                                         F.sub.II = -0.689F.sub.W                                                                            F.sub.III = 0.831F.sub.W                                  r.sub.I-1 = 1.097F.sub.W                                                                            |r.sub.II | = 0.909F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.35878                                                    Δν.sub.I = 21.1                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as whole.
 21. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 102.732                                                               d.sub.1 = 5.8   n.sub.1 = 1.641                                                                            ν.sub.1 = 56.9                                 r.sub.2 = -162.479                                                              d.sub.2 = 2.3   n.sub.2 = 1.61293                                                                          ν.sub.2 = 37                                   r.sub.3 = 361.524                                                               d.sub.3 = D.sub.1  (variable)                                                 r.sub.4 = -83.421                                                               d.sub.4 = 2.0   n.sub.3 = 1.62012                                                                          ν.sub.3 = 49.7                                 r.sub.5 = 32.836                                                                d.sub.5 = 4.0   n.sub.4 = 1.76182                                                                          ν.sub.4 = 26.6                                 r.sub.6 = 71.388                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 121.646                                                               d.sub.7 = 2.1   n.sub.5 = 1.69895                                                                          ν.sub.5 = 30.1                                 r.sub.8 = 33.117                                                                d.sub.8 = 7.3   n.sub.6 = 1.6583                                                                           ν.sub.6 = 57.3                                 r.sub.9  = -88.167                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 53.895                                                               d.sub.10 = 4.4  n.sub.7 = 1.6485                                                                           ν.sub.7 = 53                                   r.sub.11 = 365.658                                                              d.sub.11 = 6.5                                                                r.sub.12 = -65.215                                                              d.sub.12 = 2.5  n.sub.8 = 1.57957                                                                          ν.sub.8 = 53.8                                 r.sub.13 = 71.468                                                               d.sub.13 = 3.5                                                                r.sub.14 = -77.557                                                              d.sub.14 = 3.5  n.sub.9 = 1.6485                                                                           ν.sub.9 = 53                                   r.sub.15 = -41.329                                                             ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.21    5.861        38.303   7.685                                          150.42   26.861        17.303  28.685                                          193.98   40.861         3.303  42.685                                          ______________________________________                                         F.sub.II = -0.696F.sub.W                                                                            F.sub.III = 0.822F.sub.W                                  r.sub.I-1 = 0.995F.sub.W                                                                            |r.sub.II | = 0.808F.sub.W              Δ--N.sub.II +  Δ--N.sub.III = 0.18235                                                   Δν.sub.I = 19.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 22. A bright and compact optical-compensation type zoom lens system according to claim 16, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 92.369                                                                d.sub.1 = 5.18  n.sub.1 = 1.641                                                                            ν.sub.1 = 56.9                                 r.sub.2 = -124.044                                                              d.sub.2 = 2.09  n.sub.2 = 1.61293                                                                          ν.sub.2 = 37                                   r.sub.3 = 319.244                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -79.057                                                               d.sub.4 = 1.8   n.sub.3 = 1.6825                                                                           ν.sub.3 = 44.7                                 r.sub.5 = 31.23                                                                 d.sub.5 = 4     n.sub.4 = 1.80518                                                                          ν.sub.4 = 25.4                                 r.sub.6 = 76.086                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 116.231                                                               d.sub.7 = 1.89  n.sub.5 = 1.74077                                                                          ν.sub.5 = 27.8                                 r.sub.8 = 30.789                                                                d.sub.8 = 7.5   n.sub.6 = 1.697                                                                            ν.sub.6 = 48.5                                 r.sub.9 = -82.003                                                               d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 65.384                                                               d.sub.10 = 6.4  n.sub.7 = 1.6583                                                                           ν.sub.7 = 53.4                                 r.sub.11 = 560.402                                                              d.sub.11 = 9.47                                                               r.sub.12 = -58.027                                                              d.sub.12 = 3.65 n.sub.8 = 1.57135                                                                          ν.sub.8 = 52.9                                 r.sub.13 = 82.065                                                               d.sub.13 = 4.5                                                                r.sub.14 = -76.837                                                              d.sub.14 = 4.5  n.sub.9 = 1.6583                                                                           ν.sub.9 = 57.3                                 r.sub.15 =  -41.224                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.47    5.166        32.565   5.851                                          150.12   23.766        13.965  24.451                                          193      36.166         1.565  36.851                                          ______________________________________                                         F.sub.II = -0.625F.sub.W                                                                            F.sub.III = 0.731F.sub.W                                  r.sub.I-1 = 0.893F.sub.W                                                                            |r.sub.II | = 0.764F.sub.W              Δ--N.sub.II + Δ--N.sub.III =  0.16645                                                   Δν.sub.I = 19.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 23. A bright and compact optical-compensation type zoom lens system according to claim 1, in which said first lens group I comprises a cemented doublet consisting of a positive lens element and negative lens element, said second lens group II comprises a cemented doublet consisting of a negative lens element and positive lens element, said third lens group III comprises a cemented doublet consisting of a negative lens element and positive lens element, and said fourth lens group IV comprises a positive lens component and negative lens component.
 24. A bright and compact optical-compensation type zoom lens system according to claim 23, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 84.518                                                                d.sub.1 = 2.5   n.sub.1 = 1.6398                                                                           ν.sub.1 = 34.5                                 r.sub.2 = 46                                                                    d.sub.2 = 5.74  n.sub.2 = 1.641                                                                            ν.sub.2 = 56.9                                 r.sub.3 = 198.951                                                               d.sub.3  D.sub.1 (variable)                                                   r.sub.4 = -78.795                                                               d.sub.4 = 2.13  n.sub.3 = 1.56883                                                                          ν.sub.3 = 56.1                                 r.sub.5 = 36.692                                                                d.sub.5 = 4.27  n.sub.4 = 1.78472                                                                          ν.sub.4 = 25.7                                 r.sub.6 = 66.303                                                                d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 170.898                                                               d.sub.7 = 2.67  n.sub.5 = 1.72825                                                                          ν.sub.5 = 28.5                                 r.sub.8 = 36.304                                                                d.sub.8 = 7.48  n.sub.6 = 1.697                                                                            ν.sub.6 = 48.5                                 r.sub.9 = - 89.32                                                               d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 96.33                                                                d.sub.10 = 4    n.sub.7 = 1.6516                                                                           ν.sub.7 = 58.7                                 r.sub.11 = 249.545                                                              d.sub.11 = 2.43                                                               r.sub.12 = -135.661                                                             d.sub.12 = 4    n.sub.8 = 1.53256                                                                          ν.sub.8 = 45.9                                 r.sub.13 = -255.847                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.28    4.908        43.74    8.179                                          150      26.961        21.687  30.232                                          193.59   41.761         6.887  45.032                                          ______________________________________                                         F.sub.II = -0.73F.sub.W                                                                             F.sub.III = 0.877F.sub.W                                  r.sub.I-1 = 0.818F.sub.W                                                                            |r.sub.II | = 0.763F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.24714                                                    Δν.sub.I = 22.4                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole.
 25. A bright and compact optical-compensation type zoom lens system according to claim 23, in which said zoom lens system having the following numerical data:

    ______________________________________                                         r.sub.1 = 84.075                                                                d.sub.1 = 6.2   n.sub.1 = 1.641                                                                            ν.sub.1 = 56.9                                 r.sub.2 = -170.085                                                              d.sub.2 = 2.3   n.sub.2 = 1.61293                                                                          ν.sub.2 = 37                                   r.sub.3 = 190.102                                                               d.sub.3 = D.sub.1 (variable)                                                  r.sub.4 = -75.21                                                                d.sub.4 = 2     n.sub.3 = 1.57135                                                                          ν.sub.3 = 52.9                                 r.sub.5 = 35.178                                                                d.sub.5 = 4     n.sub.4 = 1.78472                                                                          ν.sub.4 = 25.7                                 r.sub.6 =  64.055                                                               d.sub.6 = D.sub.2 (variable)                                                  r.sub.7 = 148.889                                                                d.sub.7 = 2.2  n.sub.5 = 1.7285                                                                           ν.sub.5 = 28.5                                 r.sub.8 = 34.759                                                                d.sub.8 = 7.5   n.sub.6 = 1.697                                                                            ν.sub.6 = 48.5                                 r.sub. 9 = -90.578                                                              d.sub.9 = D.sub.3 (variable)                                                  r.sub.10 = 108.982                                                              d.sub.10 = 3    n.sub.7 = 1.691                                                                            ν.sub.7 = 54.8                                 r.sub.11 = 417.251                                                              d.sub.11 = 1.97                                                               r.sub.12 = -135.649                                                             d.sub.12 = 4.2  n.sub.8 = 1.53172                                                                          ν.sub.8 = 48.9                                 r.sub.13 = -368.112                                                            ______________________________________                                         F        D.sub.1       D.sub.2 D.sub.3                                         ______________________________________                                         103.45    5.595        42.225  12.463                                          149.94   26.582        21.238  33.45                                           193      40.615         7.205  47.483                                          ______________________________________                                         F.sub.II = -0.696F.sub.W                                                                            F.sub.III = 0.84F.sub.W                                   r.sub.I-1 = 0.813F.sub.W                                                                            |r.sub.II | = 0.727F.sub.W              Δ--N.sub.II + Δ--N.sub.III = 0.24462                                                    Δν.sub.I = 19.9                                  ______________________________________                                    

wherein reference symbols r₁, r₂, . . . respectively represent radii of curvature of respective lens surfaces, reference symbols d₁, d₂, . . . respectively represent thicknesses of respective lenses and airspaces between respective lenses, reference symbols n₁, n₂, . . . respectively represent refractive indices of respective lenses, reference symbols ν₁, ν₂, . . . respectively represent Abbe's numbers of respective lenses, and reference symbol F represents the focal length of the lens system as a whole. 